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New infrastructure is added which creates a set number of workers (threads on Windows, forked processes on Unix). Jobs are then handed out to these workers by the master process as needed. pg_restore is adjusted to use this new infrastructure in place of the old setup which created a new worker for each step on the fly. Parallel dumps acquire a snapshot clone in order to stay consistent, if available. The parallel option is selected by the -j / --jobs command line parameter of pg_dump. Joachim Wieland, lightly editorialized by Andrew Dunstan.
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* parallel.h
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*
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* Parallel support header file for the pg_dump archiver
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* The author is not responsible for loss or damages that may
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* result from its use.
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*
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* IDENTIFICATION
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* src/bin/pg_dump/parallel.h
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*
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*-------------------------------------------------------------------------
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*/
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#include "pg_backup_db.h"
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struct _archiveHandle;
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struct _tocEntry;
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typedef enum
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{
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WRKR_TERMINATED = 0,
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WRKR_IDLE,
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WRKR_WORKING,
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WRKR_FINISHED
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} T_WorkerStatus;
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typedef enum T_Action
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{
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ACT_DUMP,
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ACT_RESTORE,
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} T_Action;
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/* Arguments needed for a worker process */
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typedef struct ParallelArgs
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{
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struct _archiveHandle *AH;
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struct _tocEntry *te;
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} ParallelArgs;
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/* State for each parallel activity slot */
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typedef struct ParallelSlot
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{
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ParallelArgs *args;
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T_WorkerStatus workerStatus;
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int status;
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int pipeRead;
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int pipeWrite;
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int pipeRevRead;
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int pipeRevWrite;
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#ifdef WIN32
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uintptr_t hThread;
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unsigned int threadId;
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#else
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pid_t pid;
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#endif
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} ParallelSlot;
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#define NO_SLOT (-1)
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typedef struct ParallelState
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{
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int numWorkers;
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ParallelSlot *parallelSlot;
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} ParallelState;
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extern int GetIdleWorker(ParallelState *pstate);
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extern bool IsEveryWorkerIdle(ParallelState *pstate);
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extern void ListenToWorkers(struct _archiveHandle * AH, ParallelState *pstate, bool do_wait);
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extern int ReapWorkerStatus(ParallelState *pstate, int *status);
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extern void EnsureIdleWorker(struct _archiveHandle * AH, ParallelState *pstate);
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extern void EnsureWorkersFinished(struct _archiveHandle * AH, ParallelState *pstate);
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extern ParallelState *ParallelBackupStart(struct _archiveHandle * AH,
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RestoreOptions *ropt);
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extern void DispatchJobForTocEntry(struct _archiveHandle * AH,
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ParallelState *pstate,
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struct _tocEntry * te, T_Action act);
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extern void ParallelBackupEnd(struct _archiveHandle * AH, ParallelState *pstate);
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extern void checkAborting(struct _archiveHandle * AH);
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